Flexible strip processing line suitable for producing various high-strength steel

A high-strength steel and processing line technology, applied in the direction of heat treatment furnace, heat treatment equipment, process efficiency improvement, etc., can solve the problem of inability to produce high-strength grade hot-dip galvanized and plated alloyed hot-dip galvanized sheets, affecting the surface quality of cold-rolled sheets Normal operation, poor surface quality of high-strength cold-rolled sheets, etc., to achieve the effect of rich product variety, low alloy content and low production cost

Active Publication Date: 2010-08-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] First of all, due to the lack of high hydrogen jet cooling with rapid cooling capacity and water quenching and pickling process, the dual-purpose manufacturing method of this patent not only cannot produce high-strength hot-dip galvanized and coating alloyed hot-dip galvanized sheets, even good Phase-change strengthened hot-dip galvanized and coating alloyed hot-dip galvanized sheets with lower strength levels of surface quality cannot be produced;
[0018] Secondly, because the pickling process after water quenching and the reheating and tempering process were not adopted, the high-strength cold-rolled sheet produced by the combine

Method used

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  • Flexible strip processing line suitable for producing various high-strength steel
  • Flexible strip processing line suitable for producing various high-strength steel
  • Flexible strip processing line suitable for producing various high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1

[0052] Referring to Figure 1, the process route of the present embodiment is, raw material 1-uncoiling cleaning 2-heating 3-soaking 4-slow cooling 5-jet cooling 6 (high hydrogen jet cooling)-overaging 10-final cooling 11-leveling 12- Finishing 13 - Oiling and post-processing 14 - Coiling 15 - Finished product 16.

[0053] The process of the invention can produce general cold-rolled sheets and phase-transformation-strengthened high-strength steel cold-rolled sheets, and is especially suitable for the production of cold-rolled TRIP steel and DP steel below 80 kilograms, cold-rolled 80 kilograms of TRIP steel and 80 kilograms of DP steel The process parameters are shown in Table 1. As can be seen in Table 1, for TRIP steel, it is important to control the soaking temperature, aging temperature and time of its continuous annealing, and the rapid cooling rate is not required; for high-strength DP steel, its continuous annealing is not high. The key process contr...

Example Embodiment

[0057] Example 2

[0058] Referring to Figure 2, the process route of the present embodiment is, raw material 1-uncoiling cleaning 2-heating 3-soaking 4-slow cooling 5-jet cooling 6 (high hydrogen jet cooling)-reheating 9-overaging 10-final cooling 11 - Flattening 12 - Finishing 13 - Oiling and post-processing 14 - Coiling 15 - Finished product 16.

[0059] Compared with Example 1, the process of the present invention can realize the over-aging process of low temperature and then high temperature. This process can use low-carbon aluminum killed steel to produce mild steel products with excellent anti-aging properties, and produce low-carbon aluminum products with excellent anti-aging properties. The process parameters of the killed mild steel product are shown in Table 2. As can be seen in Table 2, in order to produce low-carbon aluminum killed steel with excellent aging resistance, it is important to control the soaking temperature and aging process of its continuous anneali...

Example Embodiment

[0065] Example 3

[0066] Referring to FIG. 3, the process route of this embodiment is, raw material 1-uncoiling cleaning 2-electroplating 17 (electroplating Fe or Ni)-reheating 9-hot-dip galvanizing 18-alloying 19-final cooling 11-leveling 12-passivation ( or including oiling) and post-processing 20-finishing 13-oiling and post-processing 14-coiling 15-finished product 16.

[0067] The process of this embodiment uses high-strength or ultra-high-strength hot-rolled acid-washed sheets (such as hot-rolled high-strength steel) as raw materials, and by plating extremely thin layers of Ni, Fe and other elements on the surface, the hot-dip galvanizing of high-strength steel is improved. Then heat it to between 450 and 550 ° C, hot-dip galvanizing (or alloying with the coating) in a zinc pot, and then cool to enter the post-process such as leveling. Due to the short reheating galvanizing time (within one minute), the decomposition of the strengthening phase can be greatly reduced or...

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Abstract

The invention discloses a flexible strip processing line suitable for producing various high-strength steel, which has the following configuration: decoiling, cleaning, heating, soaking and slow cooling stations are arranged sequentially to a gas jet cooling station and a water quenching cooling station; a reheating station is arranged on the rear of the gas jet cooling station; an overaging station or hot galvanizing station and coating normalizing and annealing station are arranged on the rear of the reheating station, and a movable bypass channel is connected with the reheating and overaging stations; then, final cooling and leveling stations are arranged, and oiling or passivating and other postreatment stations are connected to a coiling station so as to obtain finished products; an acid pickling and electroplating stations are arranged corresponding to the water quenching cooling station; and a connecting channel is arranged on the rear of the electroplating station, and is correspondingly connected with the reheating or directly connected with the passivating station and other posttreatment stations. The flexible strip processing line integrates production of common cold-rolled sheets, and hot dip galvanized and coating alloying annealed sheets and electroplating of Zn and Ni sheets, particularly superstrength cold-rolled sheets, galvanized sheets and hot dip galvanized and coating alloying annealed sheets to one machine set so as to realize flexible production.

Description

technical field [0001] The invention relates to strip steel heat treatment and surface treatment technology, in particular to a flexible strip steel treatment line suitable for producing various high-strength steels. Background technique [0002] Protecting the environment and realizing sustainable development have become the consensus of mankind in the 21st century. With the development of the modern automobile industry, weight reduction and energy saving have become the general trend. The results of automobile lightweight research show that in order to achieve the purpose of "weight reduction, energy saving, and emission reduction", the automobile industry must use a large amount of high-strength steel to reduce the thickness of the steel plate used. Therefore, the demand for high-strength cold-rolled sheets and hot-dip galvanized sheets has greatly increased. [0003] High-strength cold-rolled sheets are produced by a continuous annealing unit with a rapid cooling devic...

Claims

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Application Information

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IPC IPC(8): C21D9/52
CPCC21D9/46C21D8/02C21D8/04C21D9/48C23C2/40C21D9/52C23C2/003C23C2/024C23C2/02C23C2/26C23C2/0224C23C2/0038C23C2/06
Inventor 李俊张理扬
Owner BAOSHAN IRON & STEEL CO LTD
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